1. BeiDou (COMPASS) Navigation Satellite System Development
Munich Satellite Navigation Summit 2010
BeiDou (COMPASS) Navigation Satellite System Development
China Satellite Navigation Office
Mar. 9th-11th, 2010, Munich 1

2. “www.beidou.gov.cn” or “www.compass.gov.cn”.
The governmental website of BeiDou Satellite Navigation System was launched on Jan. 15, 2010.
“ or “
The English version will be online soon. 2

3. Contents 1. Basic principles 2. System General Description
3. System Deployment
4. Applications
5. Compatibility and Interoperability
6. Conclusion 3

4. Contents 1. Basic principles 2. System General Description
3. System Deployment
4. Applications
5. Compatibility and Interoperability
6. Conclusions 4

5. China determined to develop an independent satellite navigation system in 1980s’.
The BeiDou navigation demonstration system was completed in 2003, since then it has been used in many areas. Now the BeiDou navigation satellite system is under construction. 5

6. Basic Principles
Openness
Independency
Compatibility
Gradualness 6

7. Basic Principles Openness
BeiDou will provide high quality open services free of charge from direct users, and worldwide use of BeiDou is encouraged.
China will widely and thoroughly communicate with other countries on satellite navigation issues to facilitate the development of GNSS technologies and the industry. 7

8. Basic Principles Independency
China will develop and operate BeiDou system independently, and BeiDou can independently provide services for global users and particularly provide high quality services in Asia-Pacific region . 8

9. Basic Principles Compatibility
BeiDou will pursue solutions to realize compatibility and interoperability with other satellite navigation systems. 9

10. Basic Principles Gradualness
The construction of BeiDou system follows a step-by-step pattern based on technical and economic evolution in China.
BeiDou will provide long-term continuous services for users, improve system performance and ensure smooth transition during all life cycle. 10

11. Contents 1. Basic principles 2. System General Description
3. System Deployment
4. Applications
5. Compatibility and Interoperability
6. Conclusions 11

12. System Description System Structure Signal Characteristics Time System
Coordinate System
Services and Performances 12

13. System Structure Space Segment
5 GEO satellites and 30 Non-GEO satellites
GEO Satellite
MEO Satellite
Constellation 13

14. System Structure Ground Segment
The ground segment consists of Master Control Station, Upload Stations and Monitor Stations. 14

15. User terminals of BeiDou system
System Structure
User Segment
The user segment consists of BeiDou user terminals and interoperable terminals with other GNSS.
User terminals of BeiDou system 15

16. System structure User Segment
The development of user terminals is making progress steadily and related policies and standards are being studied and developed.
The technical preparation for publishing BeiDou SIS ICD (v1.0) has been finished, and the ICD as well as its update will be gradually released on the governmental website of BeiDou System. 16

17. Signal Characteristics
Frequencies
B1: ~ MHz
B2: ~ MHz
B3: ~ MHz
Till the year
Constellation
Signals (actual emission)
2012
5GEO+5IGSO+4MEO
（Regional Service）
mainly COMPASS Phase(CP) II signals
2020
5GEO+3IGSO+27MEO
（Global Service）
mainly CP III signals 17

18. Signal Characteristics
CP II: B1, B2, and B3 as below
Component
Carrier Frequency
(MHz)
Chip Rate
(cps)
Bandwidth
Modulation Type
Service
Type
B1(I)
2.046
4.092
QPSK
Open
B1(Q)
Authorized
B2(I) 24
B2(Q)
10.23 B3 18

19. Data/Symbol Rate (bps/sps)
CP III: B1, B2 and B3 as below
Component
Carrier Frequency
(MHz)
Chip Rate
(cps)
Data/Symbol Rate (bps/sps)
Modulation
Type
Service
B1-CD
1.023
50/100
MBOC(6,1,1/11)
Open
B1-CP No
B1-A
2.046
BOC（14，2）
Authorized
B2aD
10.23
25/50
AltBOC(15,10 )
B2aP
B2bD
B2bP B3
500bps
QPSK(10)
B3-AD
2.5575
BOC(15,2.5)
B3-AP 19

20. Time System
BeiDou time is named as BDT, traced to UTC, and synchronized with UTC within 100ns. The epoch time of BDT is UTC 00d 2006.
Interoperability of BDT with GPS/Galileo time was considered in the design of BeiDou time system. The offset between BDT and GPST/ GST will be measured and broadcast. 20

21. Coordinate System BeiDou uses China Geodetic System 2000 (CGS2000)
Coinciding with ITRF at a few cm level, and for most applications the difference between CGS2000 and ITRF can be ignored. 21

22. Services and Performances
Two kinds of global services
Open Service：free and open to users
Positioning Accuracy: 10 m
Timing Accuracy: 20 ns
Velocity Accuracy: 0.2 m/s
Authorized Service: ensure high reliable use even in complex situation. 22

23. Services and Performances
Two kinds of regional services
Wide area differential service
Positioning accuracy: 1 m
short message service 23

24. Contents 1.Basic principles 2.System General Description
3.System Deployment
4.Applications
5. Compatibility and Interoperability
6.Conclusion 24

25. Deployment Step 1st Step—Demonstration System COMPASS Phase I (CP I)
After 3 GEO satellites being launched since 2000, the demonstration system is able to provide basic services including positioning, timing and short-message communication in regional area. Currently, all the 3 satellites work normally in orbit.
Oct 31,2000
140E
Dec 21,2000
80E
May 25 ,2003
110.5E 25

26. COMPASS Phase II (CP II) COMPASS Phase III (CP III)
Deployment Step
2nd Step—Global System
BeiDou will cover Asia-Pacific area around 2012, and will cover all over the world before 2020.
COMPASS Phase II (CP II)
Around 2012
COMPASS Phase III (CP III)
Before 2020 26

27. COMPASS-M1 Launch
The first MEO satellite named COMPASS-M1 was launched in Apr which secured the ITU related filing. Many technical experimentations have been implemented using COMPASS-M1. 27

28. COMPASS-G2 Launch
The first GEO satellite named COMPASS-G2 was launched by a Long March-3C carrier rocket at the Xichang Satellite Launch Center on Apr The GEO navigation satellite related technologies have been verified using the satellite. 28

29. GEO Satellite Launch Latterly
The 3rd satellite of BeiDou was launched by a Long March-3C carrier rocket from the Xichang Satellite Launch Center on Jan The satellite is also the 2nd GEO satellite. 29

30. Now the satellite is in-orbit test.
On Jan. 22, the satellite was located at 160°E and started transmitting signals.
Now the satellite is in-orbit test. 30

31. Launch Schedule
More than 10 satellites will be put in orbit and the system will provide regional service before the end of 2012. 31

32. Contents 1.Basic principles of the State Policy
2.System General Description
3.System Deployment
4.Applications
5.Compatibility and Interoperability
6.Conclusion 32

33. Applications
BeiDou Navigation Demonstration System has played important roles in various areas.
Surveying and mapping
Communication
Water conservancy
Disaster mitigation
Marine
Transportation
Mining
Forest fire rescue
etc. 33

34. Contents 1.Basic principles of the State Policy
2.System General Description
3.System Deployment
4.Applications
5.Compatibility and Interoperability
6.Conclusion 34

35. Compatibility and Interoperability
Views on Compatibility and Interoperability
Related Bilateral Activities 35

36. Compatibility
Compatibility: the ability of multiple satellite navigation system to be used separately or together, without causing harmful interference with use of each individual service or signal.
International Telecommunication Union provides a framework for discussion on radiofrequency compatibility. 36

37. Compatibility Spectrum overlap:
There actually exist some cases of frequency overlap between signals of different systems and it is feasible for navigation systems to share the same frequency spectrum.
The frequency spectrum overlap of open signals is beneficial for the realization of interoperability for many applications. 37

38. Compatibility Spectrum separation of authorized service :
The authorized service signal spectrum separation with open service signals is beneficial.
Signal design should consider many factors.
Due to the quite limit of frequency resources, authorized signal spectrum separation is very difficult at present.
It’s very difficult to satisfy the frequency resource requirements of modernization signals of existing systems and the signals of new systems to be built. 38

39. Interoperability
Interoperability: the ability of open services of multiple satellite navigation system to be used together to provide better capabilities at the user level than would be achieved by relying solely on one service, without significantly increasing the complexity of receiver. 39

40. Interoperability Benefit gained is larger than cost paid
Provide better capabilities at the user level
Be easy for developing and manufacturing of interoperable receivers
Broadcast interoperability information including the time differences between various System Time mutually
Comparative max received power is beneficial for interoperability
Common frequency spectrum is important
Frequency diversity is beneficial for the improvement of anti-jamming capability
Possible interoperable signal s
B1-C ： MHz
B2a： MHz
B2b： MHz 40

41. Related Bilateral Activities
BeiDou
GPS
Four meetings on frequency compatibility coordination :
The 1st Meeting was held in Geneva in June 2007.
The 2nd Meeting was held in Xi’an in May 2008.
The 3rd Meeting was held in Geneva in Oct 2008.
The 4th Meeting was held in Sanya in Dec 2009. 41

42. Related Bilateral Activities
BeiDou
Galileo
The 1st frequency compatibility coordination meeting was held in Beijing in May 2007.
The 1st Technical Working Group meeting on Compatibility and Interoperability was held in Beijing in Sep 2008.
The 2nd TWG meeting was held in Beijing in Dec 2008.
The 3rd TWG meeting was held in Brussels in Jun 2009.
The 2nd frequency compatibility coordination meeting was held in Beijing in Jan 2010.
The 4th TWG meeting was held in Beijing in Jan 2010. 42

43. Related Bilateral Activities
GLONASS
BeiDou
The frequency compatibility coordination meeting was held in Moscow in Jan 2007. 43

44. Contents 1.Basic principles of the State Policy
2.System General Description
3.System Deployment
4.Applications
5.Compatibility and Interoperability
6.Conclusion 44

45. Conclusion Currently, BeiDou is developing as planned.
As an important GNSS, BeiDou seeks win-win development with other systems through active cooperation and mutual benefits. 45

46. Thanks for your attention!46